Analysis of pupil size amplitude signal in field fatigue detection

Testing Pupil Size as a Possible Alternative Metric of Physical Fatigue in Automotive Manufacturing Tasks

“…This findings is key in that it adds to the limited literature showing smaller pupil size under conditions of physical fatigue. The work by Fadda et al (2015) and by Xiao-Yan et al (2020) observed this pattern with workers largely maintaining a sitting posture during the completion of workplace tasks. Our volunteers, instead, were engaged in manufacturing operations requiring the use of upper and lower body, and core muscles to stabilize the body while producing the push and pull efforts.…”

“…The operators’ physiological activation – recorded as average heart rate – declined over time, with pupil size also decreasing from the first to the second hour of the study. Xiao-Yan and colleagues conducted a fatigue study on excavator operators (Xiao-Yan et al, 2020). Participants were instructed to operate a real excavator for 2 hours.…”

“…Our objective with this study is to further investigate using pupil size to track changes in physical fatigue but during the completion of automotive manufacturing tasks. The work by Geacintov & Peavler (1974), Fadda et al (2015) and Xiao-Yan et al (2020) had participants complete workplace activities requiring workers maintain a stationary position for the entire task duration. We aim to test the effectiveness of using pupil size to track physical fatigue by having participants complete repeated, full-body operations requiring a wider range of upper-body and lower-body motions.…”